diff --git a/CMakeLists.txt b/CMakeLists.txt
index 340d2ab..8c40c2b 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -11,16 +11,19 @@ option(DSTALK_BUILD_GUI "Build the SDL3 GUI frontend" OFF)
 option(DSTALK_BUILD_WEB "Build the web UI frontend" OFF)
 option(DSTALK_BUILD_TESTS "Build dstalk tests" ON)
 
-add_subdirectory(dstalk-core)
-add_subdirectory(dstalk-cli)
-add_subdirectory(plugins)
+add_subdirectory(dstalk_core)
+add_subdirectory(dstalk_cli)
+# 插件按依赖层级分三个目录 / Plugins split into three directories by dependency tier
+add_subdirectory(plugins_base)
+add_subdirectory(plugins_middle)
+add_subdirectory(plugins_upper)
 
 if(DSTALK_BUILD_GUI)
-    add_subdirectory(dstalk-gui)
+    add_subdirectory(dstalk_gui)
 endif()
 
 if(DSTALK_BUILD_WEB)
-    add_subdirectory(dstalk-web)
+    add_subdirectory(dstalk_web)
 endif()
 
 if(DSTALK_BUILD_TESTS)
diff --git a/README.md b/README.md
index 9683643..e0b29ba 100644
--- a/README.md
+++ b/README.md
@@ -16,7 +16,7 @@ dstalk 是一款 AI 编程助手命令行工具, 通过调用大模型在终端
 ┌───────────────────────────────────────────────────────────┐
 │                    前端层 (Frontends)                       │
 │  ┌──────────────────┐      ┌──────────────────────────┐   │
-│  │  dstalk-cli      │      │  dstalk-gui               │   │
+│  │  dstalk_cli      │      │  dstalk_gui               │   │
 │  │  ANSI 终端 UI    │      │  SDL3 图形化 UI            │   │
 │  └────────┬─────────┘      └─────────────┬─────────────┘   │
 │           └──────────────┬───────────────┘                 │
@@ -24,7 +24,7 @@ dstalk 是一款 AI 编程助手命令行工具, 通过调用大模型在终端
 └──────────────────────────┼─────────────────────────────────┘
                            │
 ┌──────────────────────────▼─────────────────────────────────┐
-│           核心层 (dstalk-core.dll) — 插件宿主               │
+│           核心层 (dstalk_core.dll) — 插件宿主               │
 │  ┌──────────────────────────────────────────────────────┐  │
 │  │  Host: 插件加载 · 服务注册 · 事件总线 · 配置管理       │  │
 │  └──────────────────────────────────────────────────────┘  │
@@ -33,15 +33,15 @@ dstalk 是一款 AI 编程助手命令行工具, 通过调用大模型在终端
 │  │ (ai)     │ │ (ai)     │ │ (http)   │ │   客户端     │  │
 │  └──────────┘ └──────────┘ └──────────┘ └──────────────┘  │
 │  ┌──────────┐ ┌──────────┐ ┌──────────┐ ┌──────────────┐  │
-│  │ session  │ │ context  │ │ file-io  │ │    tools     │  │
+│  │ session  │ │ context  │ │ file_io  │ │    tools     │  │
 │  └──────────┘ └──────────┘ └──────────┘ └──────────────┘  │
 └─────────────────────────────────────────────────────────────┘
 ```
 
-- **dstalk-core** —— C11/C++20 插件化宿主 DLL, 负责插件加载、服务注册、事件总线、配置管理
-- **dstalk-cli** —— 命令行前端, ANSI 终端 UI
-- **dstalk-gui** —— 图形化前端, SDL3 跨平台窗口
-- **plugins/** —— 9 个功能插件, 编译为独立 DLL, 通过 C ABI 动态注册服务
+- **dstalk_core** —— C11/C++20 插件化宿主 DLL, 负责插件加载、服务注册、事件总线、配置管理
+- **dstalk_cli** —— 命令行前端, ANSI 终端 UI
+- **dstalk_gui** —— 图形化前端, SDL3 跨平台窗口
+- **plugins_base/、plugins_middle/、plugins_upper/** —— 9 个功能插件按三层架构分布, 编译为独立 DLL, 通过 C ABI 动态注册服务
 
 核心与界面完全解耦, 可编写自己的前端或把 AI 能力嵌入到现有工具中。
 
@@ -65,7 +65,7 @@ dstalk 是一款 AI 编程助手命令行工具, 通过调用大模型在终端
 cd tools && setup.bat    # 1. 安装工具链 (CMake / Ninja / LLVM / Conan2)
 build.bat                # 2. 编译
 # 3. 创建 config.toml    # 见教程: docs/tutorial/quick-start.md
-build/dstalk-cli/dstalk-cli.exe   # 4. 运行
+build/dstalk_cli/dstalk_cli.exe   # 4. 运行
 # 5. 输入自然语言        # "帮我写一个 C 程序"
 ```
 
diff --git a/build.bat b/build.bat
index 2333614..471ce42 100644
--- a/build.bat
+++ b/build.bat
@@ -140,7 +140,7 @@ if !errorlevel! neq 0 (
 echo.
 echo ============================================
 echo   编译成功!
-echo   build\dstalk-core\dstalk.dll
-echo   build\dstalk-cli\dstalk-cli.exe
+echo   build\bin\dstalk.dll
+echo   build\bin\dstalk_cli.exe
 echo ============================================
 pause
diff --git a/docs/explanation/architecture.md b/docs/explanation/architecture.md
index fb06424..5d63d13 100644
--- a/docs/explanation/architecture.md
+++ b/docs/explanation/architecture.md
@@ -13,7 +13,7 @@ dstalk 选择的不是单体架构，而是**以 C ABI 为边界的插件架构*
 
 2. **能力会增长**。LSP 集成、文件管理、会话持久化、工具调用——这些能力不是 CLI 启动时必须加载的。使用者可能只需要聊天，不需要 LSP。插件架构让能力按需加载，启动更快，内存更省。
 
-3. **插件作者不是核心团队**。第三方应该能用自己的编译器、自己的 C++ 标准库版本编写插件，而不必须链接 dstalk-core 的静态库。这要求 ABI 稳定。C ABI 是唯一具有跨编译器二进制兼容性的选择。
+3. **插件作者不是核心团队**。第三方应该能用自己的编译器、自己的 C++ 标准库版本编写插件，而不必须链接 dstalk_core 的静态库。这要求 ABI 稳定。C ABI 是唯一具有跨编译器二进制兼容性的选择。
 
 **一句话心智模型**: 不要想象一个胖二进制把所有功能静态链接在一起；想象一个内核 (host) + 一圈可插拔的服务单元 (plugin)，内核只负责编排，不负责实现。
 
@@ -29,7 +29,7 @@ dstalk 的架构由 3 层组成。从上到下看，每一层依赖下一层提
 │  实现具体能力：AI 聊天、文件读写、LSP...    │
 │  通过服务注册表向其他插件暴露自己的功能     │
 ├────────────────────────────────────────────┤
-│  Host (dstalk-core)                        │
+│  Host (dstalk_core)                        │
 │  拥有事件总线、服务注册表、插件加载器、配置  │
 │  提供一个 dstalk_host_api_t 接口给所有插件   │
 ├────────────────────────────────────────────┤
@@ -48,7 +48,7 @@ Host 拥有四样东西：
 - **配置存储 (ConfigStore)**: 管理 `config.toml` 的加载和键值查询。
 - **事件总线 (EventBus)**: 插件间松耦合通信的唯一通道。
 - **服务注册表 (ServiceRegistry)**: 按名称 + 版本号存储和查找服务 vtable。
-- **插件加载器 (PluginLoader)**: 扫描 `plugins/` 目录、加载 DLL、按依赖拓扑排序后调用初始化。
+- **插件加载器 (PluginLoader)**: 扫描 `plugins_base/`、`plugins_middle/`、`plugins_upper/` 三层目录、加载 DLL、按依赖拓扑排序后调用初始化。
 
 Host 启动时，按严格顺序执行：
 1. 分配上述四个组件。
diff --git a/docs/explanation/plugin-lifecycle.md b/docs/explanation/plugin-lifecycle.md
index 2ea440c..5e08734 100644
--- a/docs/explanation/plugin-lifecycle.md
+++ b/docs/explanation/plugin-lifecycle.md
@@ -52,7 +52,7 @@ Host 调用 `load_plugin(path)`，由 `PluginLoader` 执行：
 { "http", "config", NULL }
 ```
 
-依赖名称与目标插件的 `info->name` 字段匹配（如 `"file-io"` 不是 DLL 的文件名），因此依赖声明和插件命名必须一致。
+依赖名称与目标插件的 `info->name` 字段匹配（如 `"file_io"` 不是 DLL 的文件名），因此依赖声明和插件命名必须一致。
 
 ---
 
diff --git a/docs/explanation/security-logging.md b/docs/explanation/security-logging.md
index f07a48c..036ed20 100644
--- a/docs/explanation/security-logging.md
+++ b/docs/explanation/security-logging.md
@@ -18,7 +18,7 @@
 
 ## 文件清单
 
-### 1. `plugins/openai/src/openai_plugin.cpp` -- 安全
+### 1. `plugins_upper/openai/src/openai_plugin.cpp` -- 安全
 
 | 行号 | 调用 | 内容 | 风险 |
 |------|------|------|------|
@@ -31,7 +31,7 @@
 
 **parse_response() 错误路径 (行 135-151)**: HTTP 错误响应体仅用于提取 JSON `error.message` 字段放入 `r.error`，不会输出到日志。原始 response_body 在解析后被 `g_host->free()` 释放。
 
-### 2. `plugins/anthropic/src/anthropic_plugin.cpp` -- 安全
+### 2. `plugins_upper/anthropic/src/anthropic_plugin.cpp` -- 安全
 
 | 行号 | 调用 | 内容 | 风险 |
 |------|------|------|------|
@@ -42,7 +42,7 @@
 
 **build_headers_json() (行 59-65)**: 构建 `{"x-api-key":"<key>","anthropic-version":"2023-06-01"}` 仅用于 HTTP 请求，不经过日志路径。
 
-### 3. `plugins/network/src/network_plugin.cpp` -- 安全
+### 3. `plugins_middle/network/src/network_plugin.cpp` -- 安全
 
 | 行号 | 调用 | 内容 | 风险 |
 |------|------|------|------|
@@ -52,7 +52,7 @@
 
 **do_post_stream() 异常路径 (行 280-282)**: `catch (std::exception& e)` 将 `e.what()` 赋值给 `result_body`。Beast/ASIO 异常消息为 OS 级别错误描述（如 "Connection refused"），不含 HTTP header/body 内容。
 
-### 4. `plugins/config/src/config_plugin.cpp` -- 安全
+### 4. `plugins_base/config/src/config_plugin.cpp` -- 安全
 
 | 行号 | 调用 | 内容 | 风险 |
 |------|------|------|------|
@@ -60,7 +60,7 @@
 
 ConfigStore 仅提供 get/set/load_file，无日志输出。
 
-### 5. `dstalk-core/src/host.cpp` -- 基础设施（不动）
+### 5. `dstalk_core/src/host.cpp` -- 基础设施（不动）
 
 | 行号 | 调用 | 内容 | 风险 |
 |------|------|------|------|
@@ -68,13 +68,13 @@ ConfigStore 仅提供 get/set/load_file，无日志输出。
 
 该文件是日志基础设施 (`host_log_impl`)，仅负责格式化输出。安全性依赖于调用方不传敏感数据（本审计已确认所有调用方均安全）。按 W9.3 禁忌不修改此文件。
 
-### 6. `dstalk-core/src/plugin_loader.cpp` -- 安全
+### 6. `dstalk_core/src/plugin_loader.cpp` -- 安全
 
 | 行号 | 调用 | 内容 | 风险 |
 |------|------|------|------|
 | -- | 无任何日志调用 | -- | 无 |
 
-### 7. `plugins/session/src/session_plugin.cpp` -- 安全
+### 7. `plugins_middle/session/src/session_plugin.cpp` -- 安全
 
 | 行号 | 调用 | 内容 | 风险 |
 |------|------|------|------|
@@ -82,7 +82,7 @@ ConfigStore 仅提供 get/set/load_file，无日志输出。
 
 该插件处理消息内容（role/content）但不记录任何消息数据到日志。
 
-### 8. `plugins/lsp/src/lsp_plugin.cpp` -- 低风险
+### 8. `plugins_base/lsp/src/lsp_plugin.cpp` -- 低风险
 
 | 行号 | 调用 | 内容 | 风险 |
 |------|------|------|------|
diff --git a/docs/tutorial/quick-start.md b/docs/tutorial/quick-start.md
index ce8da84..27bb8ee 100644
--- a/docs/tutorial/quick-start.md
+++ b/docs/tutorial/quick-start.md
@@ -32,8 +32,8 @@ build.bat
 ```
 
 编译产物输出到 `build/` 目录。核心产物:
-- `build/dstalk-core/dstalk.dll` —— 核心 DLL
-- `build/dstalk-cli/dstalk-cli.exe` —— 命令行前端
+- `build/dstalk_core/dstalk.dll` —— 核心 DLL
+- `build/dstalk_cli/dstalk_cli.exe` —— 命令行前端
 - `build/plugins/*.dll` —— 功能插件
 
 ---
@@ -69,10 +69,10 @@ api.model = "gpt-4o"
 
 ---
 
-## 4. 运行 dstalk-cli
+## 4. 运行 dstalk_cli
 
 ```bash
-build/dstalk-cli/dstalk-cli.exe
+build/dstalk_cli/dstalk_cli.exe
 ```
 
 启动后显示欢迎横幅:
diff --git a/dstalk-cli/CMakeLists.txt b/dstalk_cli/CMakeLists.txt
similarity index 65%
rename from dstalk-cli/CMakeLists.txt
rename to dstalk_cli/CMakeLists.txt
index a616718..f9afad1 100644
--- a/dstalk-cli/CMakeLists.txt
+++ b/dstalk_cli/CMakeLists.txt
@@ -1,17 +1,17 @@
 # ============================================================
-# dstalk-cli — 命令行前端 (ANSI 转义码)
+# dstalk_cli — 命令行前端 (ANSI 转义码)
 # ============================================================
 
-add_executable(dstalk-cli
+add_executable(dstalk_cli
     src/main.cpp
 )
 
-set_target_properties(dstalk-cli PROPERTIES
+set_target_properties(dstalk_cli PROPERTIES
     RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin
 )
 
 find_package(Boost REQUIRED CONFIG)
 
-target_link_libraries(dstalk-cli
+target_link_libraries(dstalk_cli
     PRIVATE dstalk boost::boost dstalk_boost_config
 )
diff --git a/dstalk-cli/src/main.cpp b/dstalk_cli/src/main.cpp
similarity index 99%
rename from dstalk-cli/src/main.cpp
rename to dstalk_cli/src/main.cpp
index df795f5..931b47b 100644
--- a/dstalk-cli/src/main.cpp
+++ b/dstalk_cli/src/main.cpp
@@ -480,7 +480,7 @@ int main(int argc, char* argv[])
         }
     }
 
-    // 初始化主机（加载配置 + 自动扫描 plugins/ 目录加载插件） / Init host: load config + auto-scan plugins/ directory
+    // 初始化主机（加载配置 + 自动扫描 plugins_base/middle/upper 目录加载插件） / Init host: load config + auto-scan plugins_base/middle/upper directories
     if (dstalk_init(config_path) != 0) {
         std::fprintf(stderr, CLR_RED "[dstalk] 初始化失败\n" CLR_RESET);
         return EXIT_CONFIG;
diff --git a/dstalk-core/CMakeLists.txt b/dstalk_core/CMakeLists.txt
similarity index 96%
rename from dstalk-core/CMakeLists.txt
rename to dstalk_core/CMakeLists.txt
index 6656ca2..57b6a34 100644
--- a/dstalk-core/CMakeLists.txt
+++ b/dstalk_core/CMakeLists.txt
@@ -1,5 +1,5 @@
 # ============================================================
-# dstalk-core — 核心 DLL (插件宿主)
+# dstalk_core — 核心 DLL (插件宿主)
 # 包含: 插件管理 / 服务注册 / 事件总线 / 配置存储
 # ============================================================
 
diff --git a/dstalk-core/include/dstalk/dstalk_host.h b/dstalk_core/include/dstalk/dstalk_host.h
similarity index 100%
rename from dstalk-core/include/dstalk/dstalk_host.h
rename to dstalk_core/include/dstalk/dstalk_host.h
diff --git a/dstalk-core/include/dstalk/dstalk_lsp.h b/dstalk_core/include/dstalk/dstalk_lsp.h
similarity index 100%
rename from dstalk-core/include/dstalk/dstalk_lsp.h
rename to dstalk_core/include/dstalk/dstalk_lsp.h
diff --git a/dstalk-core/include/dstalk/dstalk_services.h b/dstalk_core/include/dstalk/dstalk_services.h
similarity index 100%
rename from dstalk-core/include/dstalk/dstalk_services.h
rename to dstalk_core/include/dstalk/dstalk_services.h
diff --git a/dstalk-core/include/dstalk/dstalk_types.h b/dstalk_core/include/dstalk/dstalk_types.h
similarity index 100%
rename from dstalk-core/include/dstalk/dstalk_types.h
rename to dstalk_core/include/dstalk/dstalk_types.h
diff --git a/dstalk-core/src/boost_json.cpp b/dstalk_core/src/boost_json.cpp
similarity index 100%
rename from dstalk-core/src/boost_json.cpp
rename to dstalk_core/src/boost_json.cpp
diff --git a/dstalk-core/src/config_store.cpp b/dstalk_core/src/config_store.cpp
similarity index 97%
rename from dstalk-core/src/config_store.cpp
rename to dstalk_core/src/config_store.cpp
index a9961dc..b6f5fbb 100644
--- a/dstalk-core/src/config_store.cpp
+++ b/dstalk_core/src/config_store.cpp
@@ -5,7 +5,7 @@
  */
 
 #include "config_store.hpp"
-#include "../../plugins/config/include/toml_parse.h"
+#include "../../plugins_base/config/include/toml_parse.h"
 
 #include <cstdio>
 #include <fstream>
diff --git a/dstalk-core/src/config_store.hpp b/dstalk_core/src/config_store.hpp
similarity index 100%
rename from dstalk-core/src/config_store.hpp
rename to dstalk_core/src/config_store.hpp
diff --git a/dstalk-core/src/event_bus.cpp b/dstalk_core/src/event_bus.cpp
similarity index 100%
rename from dstalk-core/src/event_bus.cpp
rename to dstalk_core/src/event_bus.cpp
diff --git a/dstalk-core/src/event_bus.hpp b/dstalk_core/src/event_bus.hpp
similarity index 100%
rename from dstalk-core/src/event_bus.hpp
rename to dstalk_core/src/event_bus.hpp
diff --git a/dstalk-core/src/host.cpp b/dstalk_core/src/host.cpp
similarity index 96%
rename from dstalk-core/src/host.cpp
rename to dstalk_core/src/host.cpp
index 087c0d4..b32a6f7 100644
--- a/dstalk-core/src/host.cpp
+++ b/dstalk_core/src/host.cpp
@@ -225,14 +225,22 @@ DSTALK_API int dstalk_init(const char* config_path)
             }
         }
 
-        // 扫描插件目录 / Scan plugin directory
-        const char* plugin_dir = g_config->get("plugin_dir");
-        if (!plugin_dir) plugin_dir = "plugins";
-        int loaded = load_plugins_from_directory(plugin_dir);
+        // 扫描插件目录 / Scan plugin directories
+        // 优先扫描三级插件目录，回退到单一 plugins/ 目录（构建输出）
+        // Prefer three-tier plugin dirs, fall back to single plugins/ dir (build output)
+        const char* dirs[] = {
+            "plugins_base",  "plugins_middle",  "plugins_upper",
+            "../plugins_base", "../plugins_middle", "../plugins_upper",
+            "plugins", "../plugins",
+            nullptr
+        };
+        int loaded = 0;
+        for (int i = 0; dirs[i]; ++i) {
+            int n = load_plugins_from_directory(dirs[i]);
+            if (n > 0) loaded += n;
+        }
         if (loaded <= 0) {
-            host_log(DSTALK_LOG_WARN,
-                "No plugins found in '%s', trying '../plugins'", plugin_dir);
-            loaded = load_plugins_from_directory("../plugins");
+            host_log(DSTALK_LOG_WARN, "No plugins found in any plugin directory");
         }
 
         // 初始化所有插件 / Initialize all plugins
diff --git a/dstalk-core/src/plugin_loader.cpp b/dstalk_core/src/plugin_loader.cpp
similarity index 98%
rename from dstalk-core/src/plugin_loader.cpp
rename to dstalk_core/src/plugin_loader.cpp
index 8fddc77..d749a3b 100644
--- a/dstalk-core/src/plugin_loader.cpp
+++ b/dstalk_core/src/plugin_loader.cpp
@@ -78,7 +78,9 @@ int PluginLoader::load_plugin(const char* path)
                 has_dotdot = true;
                 break;
             }
-            if (comp == "plugins") {
+            std::string comp_str = comp.string();
+            if (comp_str == "plugins" ||
+                comp_str.substr(0, 8) == "plugins_") {
                 in_plugins_dir = true;
             }
         }
@@ -91,8 +93,8 @@ int PluginLoader::load_plugin(const char* path)
             return -1;
         }
 
-        // 目录约束：必须位于 'plugins' 目录下或为纯文件名
-        // Directory constraint: must be under a 'plugins' directory or be a plain filename
+        // 目录约束：必须位于 'plugins' 或 'plugins_*' 目录下，或为纯文件名
+        // Directory constraint: must be under a 'plugins' or 'plugins_*' directory, or be a plain filename
         if (!in_plugins_dir && p.has_parent_path()) {
             if (host_api_) {
                 host_api_->log(DSTALK_LOG_ERROR,
diff --git a/dstalk-core/src/plugin_loader.hpp b/dstalk_core/src/plugin_loader.hpp
similarity index 100%
rename from dstalk-core/src/plugin_loader.hpp
rename to dstalk_core/src/plugin_loader.hpp
diff --git a/dstalk-core/src/service_registry.cpp b/dstalk_core/src/service_registry.cpp
similarity index 100%
rename from dstalk-core/src/service_registry.cpp
rename to dstalk_core/src/service_registry.cpp
diff --git a/dstalk-core/src/service_registry.hpp b/dstalk_core/src/service_registry.hpp
similarity index 100%
rename from dstalk-core/src/service_registry.hpp
rename to dstalk_core/src/service_registry.hpp
diff --git a/dstalk-gui/CMakeLists.txt b/dstalk_gui/CMakeLists.txt
similarity index 75%
rename from dstalk-gui/CMakeLists.txt
rename to dstalk_gui/CMakeLists.txt
index fc5b88d..aa66207 100644
--- a/dstalk-gui/CMakeLists.txt
+++ b/dstalk_gui/CMakeLists.txt
@@ -1,15 +1,15 @@
 # ============================================================
-# dstalk-gui — 图形化前端 (SDL3)
+# dstalk_gui — 图形化前端 (SDL3)
 # ============================================================
 
 # 启用 DSTALK_BUILD_GUI=ON 前，确保 deps/conanfile.txt 中包含 sdl 依赖
 find_package(SDL3 REQUIRED CONFIG)
 
-add_executable(dstalk-gui
+add_executable(dstalk_gui
     src/main.cpp
 )
 
-target_link_libraries(dstalk-gui
+target_link_libraries(dstalk_gui
     PRIVATE
         dstalk
         SDL3::SDL3
diff --git a/dstalk-gui/src/main.cpp b/dstalk_gui/src/main.cpp
similarity index 100%
rename from dstalk-gui/src/main.cpp
rename to dstalk_gui/src/main.cpp
diff --git a/dstalk-web/CMakeLists.txt b/dstalk_web/CMakeLists.txt
similarity index 59%
rename from dstalk-web/CMakeLists.txt
rename to dstalk_web/CMakeLists.txt
index b1154f9..5b91e66 100644
--- a/dstalk-web/CMakeLists.txt
+++ b/dstalk_web/CMakeLists.txt
@@ -1,20 +1,20 @@
 # ============================================================
-# dstalk-web — Web 前端 / Web frontend (Boost.Beast HTTP + SSE)
+# dstalk_web — Web 前端 / Web frontend (Boost.Beast HTTP + SSE)
 # ============================================================
 
 find_package(Boost REQUIRED CONFIG)
 
-add_executable(dstalk-web
+add_executable(dstalk_web
     src/main.cpp
 )
 
-set_target_properties(dstalk-web PROPERTIES
+set_target_properties(dstalk_web PROPERTIES
     RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin
 )
 
-target_compile_features(dstalk-web PRIVATE cxx_std_20)
+target_compile_features(dstalk_web PRIVATE cxx_std_20)
 
-target_link_libraries(dstalk-web
+target_link_libraries(dstalk_web
     PRIVATE
         dstalk
         boost::boost
@@ -23,5 +23,5 @@ target_link_libraries(dstalk-web
 
 # Windows: Boost.Asio 需要 Winsock / Boost.Asio requires Winsock
 if(WIN32)
-    target_link_libraries(dstalk-web PRIVATE ws2_32)
+    target_link_libraries(dstalk_web PRIVATE ws2_32)
 endif()
diff --git a/dstalk-web/src/main.cpp b/dstalk_web/src/main.cpp
similarity index 96%
rename from dstalk-web/src/main.cpp
rename to dstalk_web/src/main.cpp
index e2f463b..49b8053 100644
--- a/dstalk-web/src/main.cpp
+++ b/dstalk_web/src/main.cpp
@@ -1,7 +1,7 @@
 /*
  * @file main.cpp
- * @brief Boost.Beast HTTP server frontend for dstalk-web: SSE streaming chat, embedded web UI, CORS support.
- * dstalk-web 的 Boost.Beast HTTP 服务端：SSE 流式对话、嵌入式网页界面、CORS 支持。
+ * @brief Boost.Beast HTTP server frontend for dstalk_web: SSE streaming chat, embedded web UI, CORS support.
+ * dstalk_web 的 Boost.Beast HTTP 服务端：SSE 流式对话、嵌入式网页界面、CORS 支持。
  * Copyright (c) 2026 dstalk contributors. GPLv3.
  */
 
@@ -423,18 +423,18 @@ public:
         beast::error_code ec;
         acceptor_.open(ep.protocol(), ec);
         if (ec) {
-            std::fprintf(stderr, "[dstalk-web] acceptor.open: %s\n", ec.message().c_str());
+            std::fprintf(stderr, "[dstalk_web] acceptor.open: %s\n", ec.message().c_str());
             return;
         }
         acceptor_.set_option(asio::socket_base::reuse_address(true), ec);
         acceptor_.bind(ep, ec);
         if (ec) {
-            std::fprintf(stderr, "[dstalk-web] acceptor.bind: %s\n", ec.message().c_str());
+            std::fprintf(stderr, "[dstalk_web] acceptor.bind: %s\n", ec.message().c_str());
             return;
         }
         acceptor_.listen(asio::socket_base::max_listen_connections, ec);
         if (ec) {
-            std::fprintf(stderr, "[dstalk-web] acceptor.listen: %s\n", ec.message().c_str());
+            std::fprintf(stderr, "[dstalk_web] acceptor.listen: %s\n", ec.message().c_str());
             return;
         }
     }
@@ -499,9 +499,9 @@ int main(int argc, char* argv[])
         }
     }
 
-    // 初始化 dstalk 主机（加载配置 + 自动扫描 plugins/ 目录） / Init dstalk host (load config + auto-scan plugins/)
+    // 初始化 dstalk 主机（加载配置 + 自动扫描 plugins_base/middle/upper 目录） / Init dstalk host (load config + auto-scan plugins_base/middle/upper)
     if (dstalk_init(config_path) != 0) {
-        std::fprintf(stderr, "[dstalk-web] dstalk_init failed\n");
+        std::fprintf(stderr, "[dstalk_web] dstalk_init failed\n");
         return 3;
     }
 
@@ -512,10 +512,10 @@ int main(int argc, char* argv[])
     g_session = static_cast<const dstalk_session_service_t*>(dstalk_service_query("session", 1));
 
     if (!g_ai) {
-        std::fprintf(stderr, "[dstalk-web] AI service not found (check plugins directory)\n");
+        std::fprintf(stderr, "[dstalk_web] AI service not found (check plugins directory)\n");
     }
     if (!g_session) {
-        std::fprintf(stderr, "[dstalk-web] Session service not found\n");
+        std::fprintf(stderr, "[dstalk_web] Session service not found\n");
     }
 
     // 从配置自动加载 AI 设置 / Auto-load AI settings from config
@@ -546,8 +546,8 @@ int main(int argc, char* argv[])
     listener.run();
 
     // 打印启动信息 / Print startup message
-    std::printf("[dstalk-web] running at http://%s:%u\n", web_host, web_port);
-    std::printf("[dstalk-web] Press Ctrl+C to stop\n");
+    std::printf("[dstalk_web] running at http://%s:%u\n", web_host, web_port);
+    std::printf("[dstalk_web] Press Ctrl+C to stop\n");
 
     // 运行事件循环（阻塞直到 g_ioc->stop() 被信号处理函数调用） / Run event loop (blocks until g_ioc->stop() called by signal handler)
     ioc.run();
@@ -556,6 +556,6 @@ int main(int argc, char* argv[])
     g_ioc = nullptr;
     dstalk_shutdown();
 
-    std::printf("[dstalk-web] stopped\n");
+    std::printf("[dstalk_web] stopped\n");
     return 0;
 }
diff --git a/dstalk-web/src/web_ui.hpp b/dstalk_web/src/web_ui.hpp
similarity index 98%
rename from dstalk-web/src/web_ui.hpp
rename to dstalk_web/src/web_ui.hpp
index 1d9565f..1529dba 100644
--- a/dstalk-web/src/web_ui.hpp
+++ b/dstalk_web/src/web_ui.hpp
@@ -1,7 +1,7 @@
 /*
  * @file web_ui.hpp
- * @brief Embedded HTML/JS chat UI served by dstalk-web.
- * 嵌入的 HTML/JS 聊天界面，由 dstalk-web 提供。
+ * @brief Embedded HTML/JS chat UI served by dstalk_web.
+ * 嵌入的 HTML/JS 聊天界面，由 dstalk_web 提供。
  * Copyright (c) 2026 dstalk contributors. GPLv3.
  */
 
diff --git a/plugins/CMakeLists.txt b/plugins/CMakeLists.txt
deleted file mode 100644
index 2a4f7da..0000000
--- a/plugins/CMakeLists.txt
+++ /dev/null
@@ -1,18 +0,0 @@
-# ============================================================
-# 插件目录 — 所有功能插件 / Plugin directory — all functional plugins
-# ============================================================
-
-# 基础插件（无依赖） / Base plugins (no dependencies)
-add_subdirectory(config)
-add_subdirectory(file-io)
-add_subdirectory(lsp)
-
-# 依赖基础插件的插件 / Plugins depending on base plugins only
-add_subdirectory(network)      # 依赖 config / depends on config
-add_subdirectory(session)      # 依赖 file_io / depends on file_io
-add_subdirectory(tools)        # 依赖 file_io / depends on file_io
-
-# 依赖其他插件的插件 / Plugins depending on non-base plugins
-add_subdirectory(context)      # 依赖 session / depends on session
-add_subdirectory(openai)       # 依赖 http, config / depends on http, config
-add_subdirectory(anthropic)    # 依赖 http, config / depends on http, config
diff --git a/plugins/file-io/CMakeLists.txt b/plugins/file-io/CMakeLists.txt
deleted file mode 100644
index 9e5223e..0000000
--- a/plugins/file-io/CMakeLists.txt
+++ /dev/null
@@ -1,9 +0,0 @@
-add_library(plugin-file-io SHARED src/file_io_plugin.cpp)
-
-target_link_libraries(plugin-file-io PRIVATE dstalk)
-
-set_target_properties(plugin-file-io PROPERTIES
-    PREFIX ""
-    LIBRARY_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/plugins"
-    RUNTIME_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/plugins"
-)
diff --git a/plugins_base/CMakeLists.txt b/plugins_base/CMakeLists.txt
new file mode 100644
index 0000000..9effc56
--- /dev/null
+++ b/plugins_base/CMakeLists.txt
@@ -0,0 +1,7 @@
+# ============================================================
+# 基础插件（无依赖） / Base plugins (no dependencies)
+# ============================================================
+
+add_subdirectory(config)
+add_subdirectory(file_io)
+add_subdirectory(lsp)
diff --git a/plugins/config/CMakeLists.txt b/plugins_base/config/CMakeLists.txt
similarity index 100%
rename from plugins/config/CMakeLists.txt
rename to plugins_base/config/CMakeLists.txt
diff --git a/plugins/config/include/toml_parse.h b/plugins_base/config/include/toml_parse.h
similarity index 100%
rename from plugins/config/include/toml_parse.h
rename to plugins_base/config/include/toml_parse.h
diff --git a/plugins/config/src/config_plugin.cpp b/plugins_base/config/src/config_plugin.cpp
similarity index 100%
rename from plugins/config/src/config_plugin.cpp
rename to plugins_base/config/src/config_plugin.cpp
diff --git a/plugins_base/file_io/CMakeLists.txt b/plugins_base/file_io/CMakeLists.txt
new file mode 100644
index 0000000..384c03f
--- /dev/null
+++ b/plugins_base/file_io/CMakeLists.txt
@@ -0,0 +1,9 @@
+add_library(plugin-file_io SHARED src/file_io_plugin.cpp)
+
+target_link_libraries(plugin-file_io PRIVATE dstalk)
+
+set_target_properties(plugin-file_io PROPERTIES
+    PREFIX ""
+    LIBRARY_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/plugins"
+    RUNTIME_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/plugins"
+)
diff --git a/plugins/file-io/src/file_io_plugin.cpp b/plugins_base/file_io/src/file_io_plugin.cpp
similarity index 98%
rename from plugins/file-io/src/file_io_plugin.cpp
rename to plugins_base/file_io/src/file_io_plugin.cpp
index 55b029a..9483981 100644
--- a/plugins/file-io/src/file_io_plugin.cpp
+++ b/plugins_base/file_io/src/file_io_plugin.cpp
@@ -91,7 +91,7 @@ static void on_shutdown() {
 }
 
 static dstalk_plugin_info_t g_info = {
-    "file-io",             // name 名称
+    "file_io",             // name 名称
     "1.0.0",               // version 版本
     "Basic file I/O service",  // description 描述
     DSTALK_API_VERSION,    // api_version
diff --git a/plugins/lsp/CMakeLists.txt b/plugins_base/lsp/CMakeLists.txt
similarity index 100%
rename from plugins/lsp/CMakeLists.txt
rename to plugins_base/lsp/CMakeLists.txt
diff --git a/plugins/lsp/src/lsp_plugin.cpp b/plugins_base/lsp/src/lsp_plugin.cpp
similarity index 100%
rename from plugins/lsp/src/lsp_plugin.cpp
rename to plugins_base/lsp/src/lsp_plugin.cpp
diff --git a/plugins_middle/CMakeLists.txt b/plugins_middle/CMakeLists.txt
new file mode 100644
index 0000000..2504a9a
--- /dev/null
+++ b/plugins_middle/CMakeLists.txt
@@ -0,0 +1,7 @@
+# ============================================================
+# 依赖基础插件的插件 / Plugins depending on base plugins only
+# ============================================================
+
+add_subdirectory(network)      # 依赖 config / depends on config
+add_subdirectory(session)      # 依赖 file_io / depends on file_io
+add_subdirectory(tools)        # 依赖 file_io / depends on file_io
diff --git a/plugins/network/CMakeLists.txt b/plugins_middle/network/CMakeLists.txt
similarity index 100%
rename from plugins/network/CMakeLists.txt
rename to plugins_middle/network/CMakeLists.txt
diff --git a/plugins/network/src/network_plugin.cpp b/plugins_middle/network/src/network_plugin.cpp
similarity index 99%
rename from plugins/network/src/network_plugin.cpp
rename to plugins_middle/network/src/network_plugin.cpp
index abc3a1f..496733f 100644
--- a/plugins/network/src/network_plugin.cpp
+++ b/plugins_middle/network/src/network_plugin.cpp
@@ -89,7 +89,7 @@ static std::unordered_map<std::string, std::string> parse_headers_json(const cha
 }
 
 // ============================================================
-// HTTP 客户端实现（改编自 dstalk-core HttpClient） / HTTP Client implementation (adapted from dstalk-core HttpClient)
+// HTTP 客户端实现（改编自 dstalk_core HttpClient） / HTTP Client implementation (adapted from dstalk_core HttpClient)
 // ============================================================
 struct HttpClientCtx {
     asio::io_context ioc;
diff --git a/plugins/session/CMakeLists.txt b/plugins_middle/session/CMakeLists.txt
similarity index 100%
rename from plugins/session/CMakeLists.txt
rename to plugins_middle/session/CMakeLists.txt
diff --git a/plugins/session/src/session_plugin.cpp b/plugins_middle/session/src/session_plugin.cpp
similarity index 100%
rename from plugins/session/src/session_plugin.cpp
rename to plugins_middle/session/src/session_plugin.cpp
diff --git a/plugins/tools/CMakeLists.txt b/plugins_middle/tools/CMakeLists.txt
similarity index 100%
rename from plugins/tools/CMakeLists.txt
rename to plugins_middle/tools/CMakeLists.txt
diff --git a/plugins/tools/src/tools_plugin.cpp b/plugins_middle/tools/src/tools_plugin.cpp
similarity index 100%
rename from plugins/tools/src/tools_plugin.cpp
rename to plugins_middle/tools/src/tools_plugin.cpp
diff --git a/plugins_upper/CMakeLists.txt b/plugins_upper/CMakeLists.txt
new file mode 100644
index 0000000..cd1de25
--- /dev/null
+++ b/plugins_upper/CMakeLists.txt
@@ -0,0 +1,7 @@
+# ============================================================
+# 依赖其他插件的插件 / Plugins depending on non-base plugins
+# ============================================================
+
+add_subdirectory(context)      # 依赖 session / depends on session
+add_subdirectory(openai)       # 依赖 http, config / depends on http, config
+add_subdirectory(anthropic)    # 依赖 http, config / depends on http, config
diff --git a/plugins/anthropic/CMakeLists.txt b/plugins_upper/anthropic/CMakeLists.txt
similarity index 100%
rename from plugins/anthropic/CMakeLists.txt
rename to plugins_upper/anthropic/CMakeLists.txt
diff --git a/plugins/anthropic/src/anthropic_plugin.cpp b/plugins_upper/anthropic/src/anthropic_plugin.cpp
similarity index 100%
rename from plugins/anthropic/src/anthropic_plugin.cpp
rename to plugins_upper/anthropic/src/anthropic_plugin.cpp
diff --git a/plugins/context/CMakeLists.txt b/plugins_upper/context/CMakeLists.txt
similarity index 100%
rename from plugins/context/CMakeLists.txt
rename to plugins_upper/context/CMakeLists.txt
diff --git a/plugins/context/src/context_plugin.cpp b/plugins_upper/context/src/context_plugin.cpp
similarity index 100%
rename from plugins/context/src/context_plugin.cpp
rename to plugins_upper/context/src/context_plugin.cpp
diff --git a/plugins/openai/CMakeLists.txt b/plugins_upper/openai/CMakeLists.txt
similarity index 94%
rename from plugins/openai/CMakeLists.txt
rename to plugins_upper/openai/CMakeLists.txt
index 9ce1216..8b4782c 100644
--- a/plugins/openai/CMakeLists.txt
+++ b/plugins_upper/openai/CMakeLists.txt
@@ -11,10 +11,10 @@ add_library(plugin-openai SHARED
 target_link_libraries(plugin-openai PRIVATE dstalk)
 
 # Boost.JSON (header-only)
-find_package(Boost REQUIRED CONFIG)
 target_link_libraries(plugin-openai PRIVATE boost::boost dstalk_boost_config)
 
 set_target_properties(plugin-openai PROPERTIES
+    PREFIX ""
     LIBRARY_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/plugins
     RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/plugins
 )
diff --git a/plugins/openai/src/openai_plugin.cpp b/plugins_upper/openai/src/openai_plugin.cpp
similarity index 100%
rename from plugins/openai/src/openai_plugin.cpp
rename to plugins_upper/openai/src/openai_plugin.cpp
diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index b0c4d2d..d2720f2 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -18,11 +18,11 @@ add_test(NAME dstalk-smoke-test COMMAND dstalk-smoke-test)
 
 add_executable(dstalk-host-api-test
     host_api_test.cpp
-    ${CMAKE_SOURCE_DIR}/dstalk-core/src/service_registry.cpp
+    ${CMAKE_SOURCE_DIR}/dstalk_core/src/service_registry.cpp
 )
 
 target_include_directories(dstalk-host-api-test
-    PRIVATE ${CMAKE_SOURCE_DIR}/dstalk-core/src
+    PRIVATE ${CMAKE_SOURCE_DIR}/dstalk_core/src
 )
 
 target_compile_features(dstalk-host-api-test
@@ -41,11 +41,11 @@ add_test(NAME dstalk-host-api-test COMMAND dstalk-host-api-test)
 
 add_executable(dstalk-event-bus-test
     event_bus_test.cpp
-    ${CMAKE_SOURCE_DIR}/dstalk-core/src/event_bus.cpp
+    ${CMAKE_SOURCE_DIR}/dstalk_core/src/event_bus.cpp
 )
 
 target_include_directories(dstalk-event-bus-test
-    PRIVATE ${CMAKE_SOURCE_DIR}/dstalk-core/src
+    PRIVATE ${CMAKE_SOURCE_DIR}/dstalk_core/src
 )
 
 target_compile_features(dstalk-event-bus-test
@@ -60,11 +60,11 @@ add_test(NAME dstalk-event-bus-test COMMAND dstalk-event-bus-test)
 
 add_executable(dstalk-service-registry-test
     service_registry_test.cpp
-    ${CMAKE_SOURCE_DIR}/dstalk-core/src/service_registry.cpp
+    ${CMAKE_SOURCE_DIR}/dstalk_core/src/service_registry.cpp
 )
 
 target_include_directories(dstalk-service-registry-test
-    PRIVATE ${CMAKE_SOURCE_DIR}/dstalk-core/src
+    PRIVATE ${CMAKE_SOURCE_DIR}/dstalk_core/src
 )
 
 target_compile_features(dstalk-service-registry-test
@@ -95,12 +95,12 @@ add_test(NAME dstalk-context-plugin-test COMMAND dstalk-context-plugin-test)
 
 add_executable(dstalk-plugin-loader-test
     plugin_loader_test.cpp
-    ${CMAKE_SOURCE_DIR}/dstalk-core/src/plugin_loader.cpp
-    ${CMAKE_SOURCE_DIR}/dstalk-core/src/boost_json.cpp
+    ${CMAKE_SOURCE_DIR}/dstalk_core/src/plugin_loader.cpp
+    ${CMAKE_SOURCE_DIR}/dstalk_core/src/boost_json.cpp
 )
 
 target_include_directories(dstalk-plugin-loader-test
-    PRIVATE ${CMAKE_SOURCE_DIR}/dstalk-core/src
+    PRIVATE ${CMAKE_SOURCE_DIR}/dstalk_core/src
 )
 
 target_compile_features(dstalk-plugin-loader-test
@@ -134,7 +134,7 @@ add_executable(dstalk-anthropic-plugin-test
 )
 
 target_include_directories(dstalk-anthropic-plugin-test
-    PRIVATE ${CMAKE_SOURCE_DIR}/dstalk-core/include
+    PRIVATE ${CMAKE_SOURCE_DIR}/dstalk_core/include
 )
 
 target_compile_definitions(dstalk-anthropic-plugin-test
@@ -161,7 +161,7 @@ add_executable(dstalk-openai-plugin-test
 )
 
 target_include_directories(dstalk-openai-plugin-test
-    PRIVATE ${CMAKE_SOURCE_DIR}/dstalk-core/include
+    PRIVATE ${CMAKE_SOURCE_DIR}/dstalk_core/include
 )
 
 target_compile_definitions(dstalk-openai-plugin-test
@@ -190,7 +190,7 @@ add_executable(dstalk-network-plugin-test
 )
 
 target_include_directories(dstalk-network-plugin-test
-    PRIVATE ${CMAKE_SOURCE_DIR}/dstalk-core/include
+    PRIVATE ${CMAKE_SOURCE_DIR}/dstalk_core/include
 )
 
 target_compile_definitions(dstalk-network-plugin-test
diff --git a/tests/anthropic_plugin_test.cpp b/tests/anthropic_plugin_test.cpp
index a357463..036b421 100644
--- a/tests/anthropic_plugin_test.cpp
+++ b/tests/anthropic_plugin_test.cpp
@@ -9,7 +9,7 @@
  */
 #define BOOST_JSON_HEADER_ONLY
 #define BOOST_ALL_NO_LIB
-#include "../plugins/anthropic/src/anthropic_plugin.cpp"
+#include "../plugins_upper/anthropic/src/anthropic_plugin.cpp"
 
 #include <cstring>
 #include <iostream>
diff --git a/tests/network_plugin_test.cpp b/tests/network_plugin_test.cpp
index cfbb842..5cc107f 100644
--- a/tests/network_plugin_test.cpp
+++ b/tests/network_plugin_test.cpp
@@ -9,7 +9,7 @@
  */
 #define _CRT_SECURE_NO_WARNINGS
 #define BOOST_ASIO_DISABLE_STD_TO_ADDRESS
-#include "../plugins/network/src/network_plugin.cpp"
+#include "../plugins_middle/network/src/network_plugin.cpp"
 
 #include <cstdio>
 #include <cstdlib>
diff --git a/tests/openai_plugin_test.cpp b/tests/openai_plugin_test.cpp
index 90034e0..b25c046 100644
--- a/tests/openai_plugin_test.cpp
+++ b/tests/openai_plugin_test.cpp
@@ -9,7 +9,7 @@
  */
 #define BOOST_JSON_HEADER_ONLY
 #define BOOST_ALL_NO_LIB
-#include "../plugins/openai/src/openai_plugin.cpp"
+#include "../plugins_upper/openai/src/openai_plugin.cpp"
 
 #include <cstring>
 #include <iostream>
diff --git a/tests/plugin_loader_test.cpp b/tests/plugin_loader_test.cpp
index fe47d72..79b1cdd 100644
--- a/tests/plugin_loader_test.cpp
+++ b/tests/plugin_loader_test.cpp
@@ -82,8 +82,8 @@ static void reset_log_state() {
     g_last_log_msg[0] = '\0';
 }
 
-// Get the absolute path to the build output plugins/ directory
-// 获取构建输出 plugins/ 目录的绝对路径
+// Get the absolute path to the plugin tier directory (plugins_base / middle / upper)
+// 获取插件层级目录 (plugins_base / middle / upper) 的绝对路径
 static fs::path get_plugins_dir() {
 #ifdef DSTALK_TEST_PLUGINS_DIR
     return fs::path(DSTALK_TEST_PLUGINS_DIR);
@@ -121,10 +121,10 @@ int main()
         CHECK(loader.load_plugin("../plugins/test.dll") == -1,
               "T1.3: ../ traversal rejected");
 
-        // T1.4: 不在 plugins/ 目录下 / not under plugins/ dir
+        // T1.4: 不在插件 tier 目录下 / not under plugin tier dir
         auto tmp = fs::temp_directory_path() / "dstalk_test_no_plugins" / "test.dll";
         CHECK(loader.load_plugin(tmp.string().c_str()) == -1,
-              "T1.4: path not under plugins/ dir rejected");
+              "T1.4: path not under plugin tier dir rejected");
 
         // T1.5: 路径中间的 .. 段 / .. segment in middle of path
         CHECK(loader.load_plugin("plugins/../secret/test.dll") == -1,
@@ -134,9 +134,9 @@ int main()
         CHECK(loader.load_plugin("plugins/test") == -1,
               "T1.6: no extension rejected");
 
-        // T1.7: 合法扩展名但不在 plugins/ 下 / valid extension but not under plugins/
+        // T1.7: 合法扩展名但不在插件 tier 目录下 / valid extension but not under plugin tier dir
         CHECK(loader.load_plugin("/etc/someconfig.so") == -1,
-              "T1.7: .so extension but not under plugins/ rejected");
+              "T1.7: .so extension but not under plugin tier dir rejected");
     }
 
     // ========================================================================
@@ -149,7 +149,7 @@ int main()
         fs::path plugins_dir = get_plugins_dir();
 
         fs::path dll_config  = plugins_dir / "plugin-config.dll";
-        fs::path dll_fileio  = plugins_dir / "plugin-file-io.dll";
+        fs::path dll_fileio  = plugins_dir / "plugin-file_io.dll";
 
         bool have_plugins = fs::exists(dll_config) && fs::exists(dll_fileio);
 
@@ -206,7 +206,7 @@ int main()
         fs::path plugins_dir = get_plugins_dir();
 
         std::vector<fs::path> dlls;
-        for (auto name : {"plugin-config.dll", "plugin-file-io.dll",
+        for (auto name : {"plugin-config.dll", "plugin-file_io.dll",
                           "plugin-context.dll", "plugin-session.dll"}) {
             fs::path p = plugins_dir / name;
             if (fs::exists(p)) dlls.push_back(p);
diff --git a/tests/smoke_test.cpp b/tests/smoke_test.cpp
index bc8de32..96ea57e 100644
--- a/tests/smoke_test.cpp
+++ b/tests/smoke_test.cpp
@@ -58,7 +58,7 @@ int main()
                << "model = \"gpt-4o\"\n";
     }
 
-    // 初始化主机（会自动扫描 plugins/ 加载插件）/ Init host (auto-scans plugins/ to load plugins)
+    // 初始化主机（会自动扫描 plugins_base/middle/upper 加载插件）/ Init host (auto-scans plugins_base/middle/upper to load plugins)
     if (dstalk_init(config_path.string().c_str()) != 0) {
         std::cerr << "dstalk_init failed\n";
         return 1;
@@ -112,7 +112,7 @@ int main()
             return 1;
         }
     } else {
-        std::cerr << "[WARN] file_io service not found (plugin may not be in plugins/ dir)\n";
+        std::cerr << "[WARN] file_io service not found (plugin may not be in plugins_base/ dir)\n";
     }
 
     // 测试服务查询: session / Test service query: session
diff --git a/模块目录和功能说明.md b/模块目录和功能说明.md
index 514b017..614436e 100644
--- a/模块目录和功能说明.md
+++ b/模块目录和功能说明.md
@@ -4,19 +4,19 @@
 
 | 目录 | 功能说明 |
 |------|---------|
-| `dstalk-core/` | 核心网关库（dstalk.dll / libdstalk.so），提供插件加载、服务注册、事件总线、配置存储、日志、内存管理 |
+| `dstalk_core/` | 核心网关库（dstalk.dll / libdstalk.so），提供插件加载、服务注册、事件总线、配置存储、日志、内存管理 |
 
 ## 二、前端模块
 
 | 目录 | 功能说明 |
 |------|---------|
-| `dstalk-cli/` | 命令行前端：ANSI 终端交互、命令解析、流式对话、工具调用、批处理/管道模式 |
-| `dstalk-gui/` | 图形界面前端：SDL3 窗口化界面、暗色主题、流式对话（默认关闭） |
-| `dstalk-web/` | Web 前端：Boost.Beast HTTP + SSE 流式推送、内嵌 HTML/CSS/JS 聊天界面（默认关闭） |
+| `dstalk_cli/` | 命令行前端：ANSI 终端交互、命令解析、流式对话、工具调用、批处理/管道模式 |
+| `dstalk_gui/` | 图形界面前端：SDL3 窗口化界面、暗色主题、流式对话（默认关闭） |
+| `dstalk_web/` | Web 前端：Boost.Beast HTTP + SSE 流式推送、内嵌 HTML/CSS/JS 聊天界面（默认关闭） |
 
 ## 三、插件模块
 
-所有插件位于 `plugins/` 目录下，通过 C ABI 与核心网关通信。
+插件按依赖层级分布在三个目录下，通过 C ABI 与核心网关通信。
 
 ### 3.1 基础插件（无依赖）
 
@@ -24,9 +24,9 @@
 
 | 目录 | 服务名 | 功能说明 |
 |------|--------|---------|
-| `plugins/config/` | `"config"` | TOML 配置文件解析、键值读写 |
-| `plugins/file-io/` | `"file_io"` | 文件读写服务 |
-| `plugins/lsp/` | `"lsp"` | 语言服务器协议 JSON-RPC 客户端（诊断、悬停、补全），自行管理子进程 |
+| `plugins_base/config/` | `"config"` | TOML 配置文件解析、键值读写 |
+| `plugins_base/file_io/` | `"file_io"` | 文件读写服务 |
+| `plugins_base/lsp/` | `"lsp"` | 语言服务器协议 JSON-RPC 客户端（诊断、悬停、补全），自行管理子进程 |
 
 ### 3.2 只依赖基础插件的插件
 
@@ -34,9 +34,9 @@
 
 | 目录 | 服务名 | 功能说明 | 依赖 |
 |------|--------|---------|------|
-| `plugins/network/` | `"http"` | HTTP/HTTPS POST 和流式请求（Boost.Beast + OpenSSL） | `config` |
-| `plugins/session/` | `"session"` | 会话消息历史管理、保存/加载、Token 计数 | `file_io` |
-| `plugins/tools/` | `"tools"` | 工具注册、Schema 管理、执行分发（内置 file_read/file_write） | `file_io` |
+| `plugins_middle/network/` | `"http"` | HTTP/HTTPS POST 和流式请求（Boost.Beast + OpenSSL） | `config` |
+| `plugins_middle/session/` | `"session"` | 会话消息历史管理、保存/加载、Token 计数 | `file_io` |
+| `plugins_middle/tools/` | `"tools"` | 工具注册、Schema 管理、执行分发（内置 file_read/file_write） | `file_io` |
 
 ### 3.3 依赖其他插件的插件
 
@@ -44,9 +44,9 @@
 
 | 目录 | 服务名 | 功能说明 | 依赖 |
 |------|--------|---------|------|
-| `plugins/context/` | `"context"` | Token 计数（UTF-8 字节估算）、上下文窗口裁剪 | `session` |
-| `plugins/openai/` | `"ai.openai"` | OpenAI 兼容格式 AI 接入（chat/stream/tools、SSE 解析） | `http`、`config` |
-| `plugins/anthropic/` | `"ai.anthropic"` | Anthropic Claude Messages API 接入（chat/stream、SSE 解析） | `http`、`config` |
+| `plugins_upper/context/` | `"context"` | Token 计数（UTF-8 字节估算）、上下文窗口裁剪 | `session` |
+| `plugins_upper/openai/` | `"ai.openai"` | OpenAI 兼容格式 AI 接入（chat/stream/tools、SSE 解析） | `http`、`config` |
+| `plugins_upper/anthropic/` | `"ai.anthropic"` | Anthropic Claude Messages API 接入（chat/stream、SSE 解析） | `http`、`config` |
 
 ### 3.4 规划中的插件（尚未实现）
 
diff --git a/编码规范和命名规范.md b/编码规范和命名规范.md
index cc4ac21..fecb83a 100644
--- a/编码规范和命名规范.md
+++ b/编码规范和命名规范.md
@@ -69,7 +69,7 @@ int ConfigStore::load_file(const char* path)
 
 | 类型 | 规则 | 示例 |
 |------|------|------|
-| 目录名 | 小写英文 + 数字 + 下划线/连字符，字母或下划线开头 | `dstalk-core`、`file-io`、`plugins` |
+| 目录名 | 小写英文 + 数字 + 下划线/连字符，字母或下划线开头 | `dstalk_core`、`file_io`、`plugins` |
 | 源文件 | 小写英文 + 下划线，字母开头 | `config_store.cpp`、`openai_plugin.cpp` |
 | 头文件 | 同源文件规则 | `dstalk_host.h`、`event_bus.hpp` |
 | 测试文件 | `<模块名>_test.cpp` | `event_bus_test.cpp`、`openai_plugin_test.cpp` |
@@ -99,7 +99,7 @@ int ConfigStore::load_file(const char* path)
 
 | 类型 | 规则 | 示例 |
 |------|------|------|
-| 插件目录 | 功能名，小写 + 连字符 | `plugins/openai/`、`plugins/file-io/` |
+| 插件目录 | 功能名，小写 + 下划线 | `plugins_upper/openai/`、`plugins_base/file_io/` |
 | 插件源文件 | `<功能名>_plugin.cpp` | `openai_plugin.cpp`、`session_plugin.cpp` |
 | CMake 目标 | `plugin-<功能名>` | `plugin-openai`、`plugin-network` |
 | 服务注册名 | 小写 + 点号分级 | `"ai.openai"`、`"http"`、`"session"` |
@@ -116,13 +116,13 @@ int ConfigStore::load_file(const char* path)
 
 ### 4.1 目录 README
 
-- `dstalk/`（根目录）和所有二级目录（`dstalk-core/`、`dstalk-cli/`、`plugins/` 等）必须有 `README.md`
-- 三级目录（如 `plugins/openai/`）如内容简单可暂不添加
+- `dstalk/`（根目录）和所有二级目录（`dstalk_core/`、`dstalk_cli/`、`plugins_base/`、`plugins_middle/`、`plugins_upper/` 等）必须有 `README.md`
+- 三级目录（如 `plugins_upper/openai/`）如内容简单可暂不添加
 
 ### 4.2 include 路径
 
-- 公共头文件放在 `dstalk-core/include/dstalk/` 下
-- 私有实现头文件放在 `dstalk-core/src/` 下
+- 公共头文件放在 `dstalk_core/include/dstalk/` 下
+- 私有实现头文件放在 `dstalk_core/src/` 下
 - 插件不得被 core 反向依赖（core 禁止 `#include` 插件目录下的文件）
 
 ### 4.3 内存管理
@@ -135,4 +135,4 @@ int ConfigStore::load_file(const char* path)
 
 - 所有目标输出到 `${CMAKE_BINARY_DIR}/bin`（可执行文件）或 `${CMAKE_BINARY_DIR}/plugins`（插件 DLL）
 - 新前端通过 `option(DSTALK_BUILD_XXX)` 控制，默认 OFF
-- 插件在 `plugins/CMakeLists.txt` 中按依赖顺序 `add_subdirectory`
+- 插件在 `plugins_base/CMakeLists.txt`、`plugins_middle/CMakeLists.txt`、`plugins_upper/CMakeLists.txt` 中按依赖顺序 `add_subdirectory`